Not all responsiblity is with the owners of the horse in question. After all, it takes to carriers to make a lethal white foal. In a breed that is known to carry lethal white, mare owners need to know the status of their mares before they breed. If their mare is negative, it doesn't matter who they breed to. If their mare is positive, great consideration needs to be taken when looking at studs and they should not breed to a stud that has an unknown status. But a stallion owner should test their stud, IMO, and post their status for the public.
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